CN110568295B - AC/DC load fault detection circuit and detection method thereof - Google Patents
AC/DC load fault detection circuit and detection method thereof Download PDFInfo
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- CN110568295B CN110568295B CN201910938933.8A CN201910938933A CN110568295B CN 110568295 B CN110568295 B CN 110568295B CN 201910938933 A CN201910938933 A CN 201910938933A CN 110568295 B CN110568295 B CN 110568295B
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 238000013500 data storage Methods 0.000 claims abstract description 37
- 230000002159 abnormal effect Effects 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 11
- 230000005856 abnormality Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses an AC/DC load fault detection circuit and a detection method thereof. The circuit comprises a first current transformer, a second current transformer and a power measurement unit. The method comprises the following steps: when a fault occurs, the data storage unit receives current power data; comparing the current power data with stored previously received power data; when the current power data is different from the power data received in the previous time and the main control unit does not send new working mode information, receiving direct-current output current data of the switching power supply; comparing the received dc output current data with reference dc current data; if the DC current data is deviated from the reference DC current data, the DC load is abnormal. If there is no deviation, the AC load is abnormal. The circuit and the method monitor whether the working state of the alternating current or direct current load is normal, solve the problem that the alternating current load is difficult to detect the abnormal working state, and the load can detect faults in real time during working, thereby improving the working safety and reliability of the whole machine.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an AC/DC load fault detection circuit and a detection method thereof.
Background
An ac load detection circuit based on a photocoupler is disclosed in the international publication WO2017064632A1, which discloses only a method of a photocoupler and detects only an ac load.
Disclosure of Invention
The invention aims to solve the technical problem of providing an alternating current/direct current load fault detection circuit and a detection method thereof, which can detect alternating current load faults and direct current load faults.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the present invention provides an ac/dc load fault detection circuit. The AC/DC load fault detection circuit comprises: the power measuring device comprises a first current transformer with one side coil connected in series between alternating current mains supply and an alternating current load of a switching power supply module, a second current transformer with one side coil led out from the switching power supply module, a power measuring unit connected with the other side coil of the first current transformer, a data storage unit connected with the other side coil of the second current transformer, and a main control unit, wherein the main control unit is connected with the data storage unit, and the data storage unit is connected with the power measuring unit.
Optionally, for the ac/dc load fault detection circuit, the power measurement unit comprises a power meter and/or an electricity meter.
Optionally, for the ac/dc load fault detection circuit, the data storage unit includes an operational amplifier unit that integrally stores data.
Optionally, for the ac/dc load fault detection circuit, the data storage unit includes a memory for storing measured power received from the power measurement unit at different times in respective operation mode categories.
Optionally, for the ac/dc load fault detection circuit, the data storage unit includes reference dc current data stored in each of the operation mode categories.
Optionally, for the ac/dc load fault detection circuit, each operating mode is represented by a different operating mode code.
On the other hand, a detection method of the AC/DC load fault detection circuit is provided. The detection method comprises the following steps: when a fault occurs, the data storage unit receives current power data measured by the power measurement unit; comparing the current power data with stored previously received power data; when the current power data is different from the power data received in the previous time and the main control unit does not send new working mode information, receiving the direct-current output current data of the switching power supply detected by the second current transformer; comparing the received DC output current data of the switching power supply with reference DC current data; if the direct current output current data is deviated from the reference direct current data, judging that the direct current load is abnormal; if the direct current output current data and the reference current data have no deviation, the alternating current load is judged to be abnormal.
Optionally, the method for detecting the ac/dc load fault detection circuit further includes: in normal operation, the data storage unit receives current power data measured by the power measurement unit; receiving working mode information and reference direct current data of the working mode from a main control unit; the current power data is stored under the category of the received operation mode.
Optionally, for the method for detecting an ac/dc load fault, when the power measurement unit includes a coulometer, the data storage unit receives current power data measured by the power measurement unit, and includes: receiving current electric quantity data measured by an electric quantity meter; and counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
Optionally, the method for detecting the ac/dc load fault detection circuit further includes: when judging that the direct current load is abnormal, the main control unit displays a fault code of the direct current load abnormality; when the alternating current load is judged to be abnormal, the main control unit displays a fault code of the alternating current load abnormality.
Compared with the prior art, the technical scheme of the invention has the main advantages that:
according to the AC/DC load fault detection circuit and the detection method thereof, the working power and the working current are detected by adding the power measurement unit and the two current transformers to monitor whether the working state of the AC or DC load is normal or not. The problem that an alternating current load is difficult to detect abnormal working states such as open, short circuit, not in place and the like is solved, the load can detect faults in real time during working, and the safety and reliability of the whole machine working are improved.
The AC/DC load fault detection circuit and the detection method thereof in the embodiment of the invention judge whether the AC or DC load has faults or not by detecting the magnitude of the input power and comparing the input power with the normal working power in the working mode (working state) at the moment. If the working state of the load is normal, the detection circuit collects normal data and stores the normal data into the local memory; if the working state of the load is abnormal, the detection circuit collects abnormal data, compares the abnormal data with normal data in the local memory and sends a load abnormal signal to the main control chip. The main control chip can further display fault codes or fault prompts, and intelligence and user experience are improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic structural diagram of an ac/dc load fault detection circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a detection method of an ac/dc load fault detection circuit according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 is a schematic structural diagram of an ac/dc load fault detection circuit according to an embodiment of the present invention. As shown in fig. 1, the ac/dc load fault detection circuit provided in this embodiment includes a first current transformer 140 having one side coil connected in series between an ac mains supply 110 and an ac load 130 of a switching power supply module 120, a second current transformer 150 having one side coil led out from the switching power supply module 120, a power measurement unit 160 connected to the other side coil of the first current transformer 140, a data storage unit 170 connected to the other side coil of the second current transformer 150, and a main control unit 180, wherein the main control unit 180 is connected to the data storage unit 170, and the data storage unit 170 is connected to the power measurement unit 160. The ac/dc load fault detection circuit further includes a dc load connected to the output of the switching power module 120.
The power measurement unit 160 may include a power meter and/or an electricity meter. The electricity meter can be used for replacing the power meter, the electricity meter calculates the electricity quantity during working, the electricity quantity Q=the power P is the time T, the electricity quantity in a certain time can represent the success rate, and if the electricity meter is used, the electricity quantity data of the electricity quantity in a unit time after a period of subsequent measurement is the power data. The access location of the fuel gauge is the same as the access location of the power gauge.
The data storage unit 170 may include an op-amp unit that integrally stores data, and may store data at a previous time or compare data at a next time with data at a previous time.
The data storage unit 170 may include a memory that stores measured power received from the power measurement unit at different times in respective operation mode categories. The data storage unit 170 may include direct current data of the reference stored in each operation mode category. The respective operation modes may be represented by different operation mode codes. The measured powers received at different times in each operation mode category may be stored in order of reception time from early to late. For example, the data storage unit 170 stores the operation powers of different operation modes in the operation mode codes, respectively, in the following manner:
operation mode A1: power 1, power 2, power 3 … …;
operation mode A2: power 1, power 2, power 3 … …;
…。
the operating modes of each machine are different for different operating modes, and the operating power will be different as long as the load is different. In the above example, "power 1, power 2, and power 3 … …" refer to power data at different times.
Fig. 2 is a flowchart of a detection method of an ac/dc load fault detection circuit according to another embodiment of the present invention.
As shown in fig. 2, in step S210, upon occurrence of a fault, the data storage unit receives current power data measured by the power measurement unit. When the machine fails, the data storage unit receives abnormal working power of the machine detected by the first current transformer and the power measuring unit.
In step S220, the current power data is compared with the stored previously received power data.
In step S230, when the current power data is different from the power data received previously and the main control unit does not transmit the new operation mode information, the dc output current data of the switching power supply detected by the second current transformer is received. The comparison finds that the power data is different from the stored power data received in the previous time, and the main control unit does not send new working mode information, at the moment, the data storage unit receives the direct-current output current of the switching power supply detected by the second current transformer.
In step S240, the received dc output current data of the switching power supply is compared with the reference dc current data. If the dc output current data deviates from the reference dc current data, the flow proceeds to step S250. If the dc output current data has no deviation from the reference dc current data, the flow proceeds to step S260.
In step S250, it is determined that the dc load is abnormal.
In step S260, it is determined that the ac load is abnormal.
The detection method of the ac/dc load fault detection circuit of this embodiment may further include the following steps: in normal operation, the data storage unit receives current power data measured by the power measurement unit; receiving working mode information and reference direct current data of the working mode from a main control unit; the current power data is stored under the category of the received operation mode.
When the machine is in normal operation, the data storage unit does not receive the direct current output current of the switching power supply detected by the second current transformer. The second current transformer can be a current transformer LMZJ1-0.5300/5A, and the specific parameters are as follows: the current ratio is 300/5, and the secondary side direct current resistance is 120mΩ. The first current transformer and the power measuring unit detect the working power of the machine, the data storage unit receives the power data detected by the power measuring unit, and the data storage unit compares the power data with the stored power data received in the last time. The main control unit sends the working mode information to the data storage unit, and the reference direct current data of each working mode is also sent to the data storage unit. When the user switches the working mode, the main control chip obtains different reference current data.
When the power measurement unit includes a power meter, the data storage unit receiving current power data measured by the power measurement unit may include: receiving current electric quantity data measured by an electric quantity meter; and counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
When judging that the direct current load is abnormal, the main control unit displays a fault code of the direct current load abnormality to prompt a user of the abnormality; when the alternating current load is judged to be abnormal, the main control unit displays a fault code of the alternating current load abnormality to prompt a user of the abnormality.
According to the AC/DC load fault detection circuit and the detection method thereof, the working power and the working current are detected by adding the power measurement unit and the two current transformers to monitor whether the working state of the AC or DC load is normal or not. The problem that an alternating current load is difficult to detect abnormal working states such as open, short circuit, not in place and the like is solved, the load can detect faults in real time during working, and the safety and reliability of the whole machine working are improved.
The AC/DC load fault detection circuit and the detection method thereof in the embodiment of the invention judge whether the AC or DC load has faults or not by detecting the magnitude of the input power and comparing the input power with the normal working power in the working mode (working state) at the moment. If the working state of the load is normal, the detection circuit collects normal data and stores the normal data into the local memory; if the working state of the load is abnormal, the detection circuit collects abnormal data, compares the abnormal data with normal data in the local memory and sends a load abnormal signal to the main control chip. The main control chip can further display fault codes or fault prompts, and intelligence and user experience are improved.
The foregoing description is only illustrative of the invention and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the description and drawings of the invention, or direct or indirect application in other related technical fields are included in the scope of the claims.
Claims (10)
1. An ac/dc load fault detection circuit, comprising: the power supply system comprises a first current transformer, a second current transformer, a power measuring unit, a data storage unit and a main control unit, wherein one side coil of the first current transformer is connected in series between alternating current mains supply and an alternating current load, the second current transformer is led out from a switching power supply module by one side coil of the second current transformer, the power measuring unit is connected with the other side coil of the first current transformer, the data storage unit is connected with the other side coil of the second current transformer, the main control unit is connected between the alternating current mains supply and the switching power supply in parallel, the main control unit is connected with the data storage unit, and the data storage unit is connected with the power measuring unit; detecting abnormal working power of the machine through the first current transformer and the power measuring unit, comparing current power data with stored power data received in the last time, and judging whether a load is abnormal by combining the working mode information at the moment; and detecting direct current output current data of the switching power supply through the second current transformer, and comparing the direct current output current data of the switching power supply with reference direct current data under a corresponding working mode to judge the type of load abnormality.
2. An ac/dc load fault detection circuit as claimed in claim 1, wherein the power measurement unit comprises a power meter and/or an electricity meter.
3. The ac/dc load fault detection circuit of claim 1, wherein the data storage unit comprises an op-amp unit that integrally stores data.
4. An ac/dc load fault detection circuit as claimed in claim 1, wherein the data storage unit includes means for storing measured power received from the power measurement unit at different times in each of the operating mode categories.
5. An ac/dc load fault detection circuit as claimed in claim 1, wherein the data storage unit includes reference dc current data stored in each of the operating mode categories.
6. An ac/dc load fault detection circuit as claimed in claim 4 or claim 5, wherein each mode of operation is represented by a different mode code.
7. A detection method of an ac/dc load fault detection circuit as claimed in any one of claims 1 to 6, comprising:
when a fault occurs, the data storage unit receives current power data measured by the power measurement unit;
comparing the current power data with stored previously received power data;
when the current power data is different from the power data received in the previous time and the main control unit does not send new working mode information, receiving the direct-current output current data of the switching power supply detected by the second current transformer;
comparing the received DC output current data of the switching power supply with reference DC current data;
if the direct current output current data is deviated from the reference direct current data, judging that the direct current load is abnormal;
if the direct current output current data and the reference current data have no deviation, the alternating current load is judged to be abnormal.
8. The method for detecting an ac/dc load fault detection circuit as claimed in claim 7, further comprising:
in normal operation, the data storage unit receives current power data measured by the power measurement unit;
receiving working mode information and reference direct current data of the working mode from a main control unit;
the current power data is stored under the category of the received operation mode.
9. The method of detecting an ac/dc load fault detection circuit as claimed in claim 7, wherein when the power measurement unit includes a power meter, the data storage unit receives current power data measured by the power measurement unit includes:
receiving current electric quantity data measured by an electric quantity meter;
and counting according to the current electric quantity data to obtain the electric quantity data in unit time, namely the current power data.
10. The method for detecting an ac/dc load fault detection circuit as claimed in claim 7, further comprising:
when judging that the direct current load is abnormal, the main control unit displays a fault code of the direct current load abnormality;
when the alternating current load is judged to be abnormal, the main control unit displays a fault code of the alternating current load abnormality.
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| CN201910938933.8A CN110568295B (en) | 2019-09-30 | 2019-09-30 | AC/DC load fault detection circuit and detection method thereof |
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| CN201910938933.8A CN110568295B (en) | 2019-09-30 | 2019-09-30 | AC/DC load fault detection circuit and detection method thereof |
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| CN110568295B true CN110568295B (en) | 2024-03-15 |
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